I am having problems with the BES server showing the phone numbers assigned to the Blackberries in the BLackberry Handheld Configuration Tool. This occurs sporatically and does not cause any problem that I know of, other than for admin purposes (i.e. knowing their phone number).

One thing I did notice is that on the Blackberry themselves (7290 and 7100g) is that if they do not change the network to the provider (in this case Cingular) and only show "My Network" the phone number does not appear on the BES server. This also causes "My Number" to show as unknown.

So is this a BES problem or a provider problem and is there a way to force the blackberry to detect the Cingular Network? I have seen some options for manual selection, but they have not corrected the problem.

You can set the number by going into settings/sim card, click+'edit sim phone number'. When you now go into the phone app, it should show you phone number. However, on some models and/or software versions, it simply wont show it despite what you do.

We have the same issue and are in discussion with Cingular. The problem revolves around devices roaming. We have 2000 BlackBerrys here, the majority of which are through Vodafone UK. When those devices roam, the number continues to be shown in the Config Tool. However, when Cingular devices roam (we have a number over in Brazil), the number is not broadcast from the SIM card. It shows as Unknown Number on the device and is consequently not pushed to the BB Config Tool console. We have spoken to RIM about this and they insist that the issue is with the wireless network and that Cingular need to resolve this. It looks as though your problem is pretty much the same.